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Series MTO - Thermal overload relays

Thermal overload relays for M Series contactors from 0.11 to 14A.

Features and benefits

  • Control circuit up to 690V
  • Power circuit up to 690V
  • Three-pole differential (phase unbalance protection)
  • Automatic ambient temperature compensation between –25°C and +60°C
  • Choice of manual or automatic reset
  • Direct connection to contactor or independent mounting using accessories.
  • Screw and Ring terminal versions
  • Terminals protected against accidental contact in accordance with VDE 0106 T.100 and VBG4
  • Terminal numbering in accordance with EN 50005
  • Degree of protection IP20 (EN 60529)
  • Additional auxiliary contact block 1NO (with manual reset only)


  • Thermal protection against balanced overload.
  • Three-pole differential (phase unbalance protection).
  • Automatic ambient temperature compensation.
  • Front mounted selector for choosing utilisation current.
  • Reset button, 2 positions: Manual(H) and Automatic(A) by turning the blue selector.
  • Stop push-button, independent of reset (red).
  • Manual trip lever (tripping test).
  • Tripping indicator (0-1).
  • To facilitate wiring arrangements terminal 96 fits directly onto coil terminal (A2) and terminal 14/22 fits directly onto the feedback  auxiliary contact.